how to generate homo-dimer structure from monomer

[Zhan-yang Zhu]

Angel Gutierrez wrote:
> 
> Chyh-chong Chuang wrote:
> 
> >  "TO FORM THE BIOLOGICALLY ACTIVE DIMERIC MOLECULE, THE SECOND MONOMER NEEDS
> >  TO BE GENERATED BY USING THE FOLLOWING MATRIX.
> >
> >  SYMMETRY1   1 -0.499940  0.866060 -0.000030       -0.00159
> >  SYMMETRY2   1  0.866060  0.499940 -0.000030        0.00002
> >  SYMMETRY3   1 -0.000010 -0.000040 -1.000000        0.00153
> >
> >   How to generate another monomer from this information? Or I need other
> >  information to do this?
> >
> >   Your kind response will be greatly appreciated.
> >   Thank you very much.
> >
> >  ccchuang
> >
> >   ============================================
> >     Chyh-Chong Chuang
> >     Institude of Biological Chemistry,
> >     Academia Sinica,Taipei, Taiwan
> >   --------------------------------------------
> >     Phone: 886-2-7858981 ext 7091
> >     Fax: 886-2-7883473
> >     E-Mail: ccchuang at gate.sinica.edu.tw
> >   ============================================
> 
>         Yu need to transformate trh coordinates this way:
> 
>                 Y=A*X+B
> 
> where
>         X vector with the three coordinates of model
>         Y vector with the three new coordinates
>         A 3x3 rotation matrix
>         B vector of translation


Not quiet right!!! You need to convert the coordinates  between
reciprocal space and real space.  I think the symmetry operation given
above is in reciprocal space. Once need to convert the coordinates into
reciprocal space (fractional space in crystallography?) and apply the
operation and convert back. 

> 
>         You van make a program or programs like X-plor or packages like
> CCP4 can do it for you.
> 
>         Hope it helps
> 
>         Angel
> --
> *======================================================================*
>       Angel Gutierrez Rodriguez                 CURRENT ADDRESS
>      agr at sauron.quimica.uniovi.es            angel at inoc.chalmers.se
>             X-ray Group                         Oorganisk kemi
>  Dpto. de Quimica Fisica y Analitica       Chalmers Tekniska Hogskola
>        Universidad de Oviedo                       Goteborg
>               SPAIN                                 SWEDEN
> *======================================================================*
> Once's happenstance,twice's coincidence,the third time is enemy action.
>   Play, Mr. Bond. You'll need a great deal of luck to get out of this.
>       I'm fit, I'm calm, I'm smooth, and I'm always on the limit.
> *======================================================================*

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